Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 6, Pages 7801-7811Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c22307
Keywords
MOF-to-MOF transformation; luminescence; acetone sensing; diabetes monitoring; Pb capture; water purification
Funding
- ERC Consolidator Grant [771575]
- European Research Council (ERC) [771575] Funding Source: European Research Council (ERC)
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Metal-organic frameworks (MOFs) are considered as promising materials for advanced technologies due to their unique properties. The conventional synthesis involves a direct reaction of organic linkers and metal salts, while postsynthetic modification can produce new materials or novel properties. This study demonstrates a simple and fast method to transform a nonluminescent MOF into a highly luminescent framework, showing great potential for various applications.
Metal-organic frameworks (MOFs) stand as one of the most promising materials for the development of advanced technologies owing to their unique combination of properties. The conventional synthesis of MOFs involves a direct reaction of the organic linkers and metal salts; however, their postsynthetic modification is a sophisticated route to produce new materials or to confer novel properties that cannot be attained through the traditional methods. This work describes the postsynthetic MOF-to-MOF transformation of a nonluminescent MOF (Zn-based Oxford University-1 material [Zn-BDC, where BDC = 1,4-benzene dicarboxylate] (OX-1)) into a highly luminescent framework (Ag-based Oxford University-2 material [Ag-BDC] (OX-2)) by a simple immersion of the former in a silver salt solution. The conversion mechanism exploits the uncoordinated oxygen atoms of terephthalate linkers found in OX-1, instead of the unsaturated metal sites commonly employed, making the reaction much faster. The materials derived from the OX-1 to OX-2 transformation are highly luminescent and exhibit a selective response to acetone, turning them into a promising candidate for manufacturing fluorometric sensors for the diagnosis and monitoring of diabetes mellitus. Our methodology can be extended to other metals such as lead (Pb). The fabrication of a polymer mixed-matrix membrane containing OX-1 is used as a proof-of-concept for capturing Pb ions (as pollutants) from water. This research instigates the exploration of alternative methodologies to confer MOFs with special aptitudes for photochemical sensing or for environmental applications such as water purification.
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